JP3379391B2 - Temporary deadline method and temporary deadline structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary shutoff method and a temporary shutoff structure, and more particularly to a temporary shutoff method and a temporary shutoff structure suitable for repairing or repairing an underwater structure. is there.

[0002]

2. Description of the Related Art Damage such as damage and collapse of structures due to earthquakes is not limited to structures on land, but also to underwater structures constructed on rivers and sea tops, such as bridge foundations and revetments. It has reached.

Even when such an underwater structure is damaged, it is necessary to take measures against seismic reinforcement as in the case of a land structure. When performing seismic retrofitting on underwater structures on rivers or the sea, it is necessary to remove water from the surroundings of the structures and work in a dry environment. The construction method is generally adopted.

FIG. 9 shows a typical construction state of this double cutoff construction method. The double deadline method shown in the figure is used for pier 1
This is an application example in the case of carrying out the reinforcement and repair work of No. 3, and the deadline 3 is constructed so as to surround the outer periphery of the footing 2.

The cut-off work 3 is formed by placing a sheet pile in the water bottom ground on the outer peripheral side of the footing 2 to form inner and outer walls 3a, 3b.
And a plurality of tie rods 3c connecting the inner and outer walls 3a and 3b.

[0006] In this shut-off work 3, a water filling and a stability are ensured by filling the inside stuffed sand 4 between the inner and outer walls 3a and 3b, and water in the inner wall 3a is removed so as to be in a dry state. Then, the renovation work is performed to apply the reinforcement work 5 to the outer periphery of the pier 1.

However, such a conventional double deadline construction method has the following technical problems.

[0008]

That is, in the above-mentioned double deadline construction method, since the sheet pile is driven in and out, the assembly,
There was a problem that dismantling took time and effort, and construction and removal costs of temporary structures accounted for a large proportion of the total construction cost.

Further, as shown in FIG. 9, when a sheet pile is placed under the girder at the upper part of the bridge, it is difficult to construct a long product due to clearance, so that a short product is added to the pile. There is also a problem that construction will take more time because the machine is limited.

Further, in the double cut-off method, since a large area is occupied for a long period of time, there is a problem that running water is obstructed and water traffic is obstructed, which makes construction difficult all year round.

Further, when the filling sand 4 is filled, there is a possibility that a water pollution problem may occur when the sand is put in and taken out.

The present invention has been made in view of such conventional problems, and an object of the present invention is to assemble and disassemble easily and quickly and to prevent temporary pollution by a water supply method. And to provide a temporary deadline structure.

[0013]

In order to achieve the above object, the present invention encloses an outer periphery of an underwater structure such as a bridge foundation with a temporary cut-off work, and drains the inside of the temporary cut-off work. In the temporary cut-off method for performing repairs such as repair and reinforcement of the underwater structure, the temporary cut-off is divided along the vertical and circumferential directions of the underwater structure, and includes a plurality of precast panels that can be connected to each other. , Erected a plurality of anchoring anchors, one end of which is fixed to the foundation part of the underwater structure, and after transporting the precast panel to the renovation site of the underwater structure, the divided part between the precast panels and the vertical direction While interposing a sealing material between the joint portion, the precast panel and the base portion, the fixing anchor is inserted and laminated and connected on the base portion,
In this state, the Prestressing force to the fixing anchor, a method for integrating the said base part and laminated linked precast panels, prior to introducing the prestressing force to the fixing anchor, lamination Between the connected precast panel and the underwater structure, a plurality of supporting members composed of expandable and contractible jacks are installed along the circumferential direction of the temporary cut-off work, and the precast at the bottom stage.
The pre-cap can be
The seat interposed between the strike panel and the foundation portion.
The position of the lumber is regulated . According to the temporary cut-off method constructed in this way, the precast panel, which is the main part of the temporary cut-off work, can be factory-produced in advance. After transporting to the site, insert a fixing anchor that is erected on the foundation part while inserting a sealing material between the divided part and the joint part in the vertical direction, the precast panel and the foundation part, It is constructed by integrating and connecting the foundation part and the precast panel that is laminated and connected in this state by introducing prestressing force to the anchoring anchor in this state, and on-site construction such as piling of sheet piles. It is so few that it can be easily and quickly constructed, and disassembly is also the reverse of this procedure, so it can be done just as easily and quickly. Further, in the temporary cutoff method of the present invention, before introducing the prestressing force to the fixing anchor, between the precast panel and the underwater structure that are laminated and connected, a supporting material is installed ,
When introducing the pre-stress force, it is possible to ensure the stability of the provisional deadline Engineering. In this case, since the supporting member is composed of a stretchable jack, it is possible to easily deal with the variation in the distance between the precast panel and the underwater structure. Furthermore, the present invention provides a temporary deadline for performing repairs such as repair and reinforcement of the underwater structure by surrounding the outer circumference of an underwater structure such as a bridge foundation with a temporary deadline and draining the inside of the temporary deadline. In the structure, the temporary cofferdam is divided along the vertical and circumferential directions of the underwater structure, and can be connected to each other while being inserted into a fixing anchor erected on the foundation of the underwater structure. A plurality of precast panels, the precast panel is a skin plate that separates the outer peripheral surface in a state of being connected in the circumferential direction, a plurality of vertical beams vertically fixed to the skin plate, and of the precast panel. is fixed in the vertical direction of the inner surface, a seal member is interposed and a horizontal beam which is formed in an annular shape, the joint portion of the dividing portion and the vertical direction in a stacked connection state of the precast panel coupled state, arranged in the bottom The precast path that
The precast panel and the foundation part projecting on the flannel.
The stopper that regulates the position of the sealing material
Composed with par . According to the temporary cut-off structure constructed in this way, the precast panel, which is the main part of the temporary cut-off work, can be factory-produced in advance in the same manner as the construction method, so that a high quality product can be obtained and the sheet pile Since the number of on-site works such as casting, etc. is extremely reduced, it is possible to construct easily and quickly, and disassembling is also carried out in the reverse order of this procedure, so that it can be done easily and quickly. The vertical beams include
When the precast panels are connected in the circumferential direction, a pin support portion that allows horizontal movement of the connected precast panels can be provided. According to this configuration, it is possible to prevent the bending stress from acting on the temporary shutoff when an unbalanced load is applied to the temporary shutoff. A plurality of vertical reinforcing ribs extending in the vertical direction may be provided on the inner surface side of the skin plate.

[0014]

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1
7 to 7 show one embodiment of the temporary cutoff method and the temporary cutoff structure according to the present invention. The temporary cut-off method shown in the figure illustrates a case where it is applied when performing repair work such as repair and reinforcement of the bridge 10 which is an underwater structure.

The bridge 10 includes a bridge pier 12 and a footing 14 which is a base portion integrally formed at the lower end of the bridge pier 12. The horizontal cross section of the pier 12 is substantially circular, and the footing 14 is formed in a circular shape in plan view, and a part of the lower end thereof is buried in the submarine ground 16.

The temporary cofferdam 18 of this embodiment is installed so as to encircle the outer circumference of the pier 12, and drains water on the inner side thereof to create a dry environmental condition on the outer circumference of the pier 12. used.

The temporary cofferdam 18 is a concentric circular structure having the same shape as the pier 12, and a plurality of precast panels 20 of substantially the same structure divided along the vertical direction and the circumferential direction of the pier 12. It is a main component. In the case of this embodiment, each precast panel 20 has a shape in which a circle is divided into four at equal angular intervals, and a skin plate 20a, a plurality of vertical beams 20b, and a pair of horizontal beams 20c,
It has a plurality of vertical ribs 20d.

The skin plate 20a is bent in an arc shape, and when the pre-cass panel 20 is connected in the circumferential and vertical directions, the skin plate 20a becomes cylindrical and separates the outer peripheral surface of the cut-off work 18.

The vertical beams 20b are arranged at both ends of the skin plate 20a in the circumferential direction and at the central portion thereof, and are fixed to the inner surface of the skin plate 20a in the vertical direction. A pair of vertical beams 20b fixed to both ends of the skin plate 20a
The outer peripheral surface of the is provided with a recess 20f for inserting a thick-walled steel pipe that constitutes a pin support portion described later along the vertical direction.

The pair of horizontal beams 20c are formed of arc-shaped flat plates and fixed to the end faces of the skin plate 20a and the vertical beams 20b in the vertical direction. When the precast panel 20 is connected in the circumferential vertical direction, the cross beam 20c becomes annular and reinforces the strength of the deadline 18. The horizontal beams 20c are not limited to one pair, and the skin plate 20
It may be provided in the middle of a.

Further, each horizontal beam 20c is formed with a through hole 20e for a fixing anchor 22 which will be described later. The vertical ribs 20d are on the inner peripheral surface side of the skin plate 20a and are extended and fixed in the vertical direction of the skin plate 20a.
The strength of a is reinforced.

The vertical rib 20d is not always necessary, for example, when the thickness of the skin plate 20a is increased.

Next, the precast panel 20 having the above structure.
A procedure for assembling the temporary cut-off work 18 will be described using. When assembling the temporary cofferdam 18, the precast panel 20 is manufactured in a manufacturing yard near the repair site of the bridge 10 and transported to the vicinity of the bridge 10.

On the other hand, the footing 14 is provided with a lower fixing anchor 21 having a lower end penetratingly fixed and extending vertically along the pier 12. This lower anchor 21
Is shorter than the height of the precast panel 20, and one stage of the transported precast panel 20 is sunk by inserting the insertion hole 20e provided in the cross beam 20c into the lower anchoring anchor 21, and thus the panel 20 When the assembly is completed, the coupler 25 is attached to the lower anchor 21.
The upper fixing anchor 22 is connected via the.

At this time, the lowermost precast panel 2
As shown in FIG. 4, a seal material 24 having an L-shaped cross section is interposed between the horizontal beam 20 c of 0 and the footing 14.

In FIG. 4, a member 20g is a stopper for restricting the position of the sealing material 24 protruding from the lower surface of the horizontal beam 20c installed at the bottom, and this stopper 20g is a footing. It is provided so as to surround the outer circumference of 14.

The four precast panels 20 inserted through the fixing anchors 22 are shown in FIG.
Are connected in the state shown in. In the connected state shown in the figure, the waterproof sealing material 2 is provided between the vertical beams 20b adjacent in the circumferential direction.
6. Specifically, a vertical beam 20 is provided in advance with a water blocking rubber plate interposed.
Insert the bolt 27 into the through hole formed in b,
It is performed by screwing the nut 28.

The water sealing material 26 is arranged so as to cover the recess 20f provided in the vertical beam 20b, and the recess 20f is provided.
A thick steel pipe 30 is inserted in the. The recess 20f and the thick-walled steel pipe 30 form a pin support portion. The water sealing material 26 is a precast panel 2 assembled in a cylindrical shape.
It has a length of 0 from the upper end to the lower end.

The thick-walled steel pipe 28 has substantially the same length as the waterproof seal material 26, and the lower end thereof is located at a position spaced upward from the upper surface of the horizontal beam 20b as shown in FIG. . The through hole into which the bolt 27 is inserted is formed to be long in the horizontal direction, and the precast panel 20 connected by the bolt 27 and the nut 28 can be moved in the horizontal direction.

The structure for forming the pin support is not limited to the groove between the recess 20f and the thick-walled steel pipe 30, but for example, as shown in FIG. The structure may be such that the portion 20h is provided and the water blocking sealing material 26 is sandwiched between the uneven portions 20h.

By connecting the bolt 27 and the nut 28,
When the individual precast panels 20 are connected in the circumferential direction to form an annular portion for one step, the precast panels 20 are sequentially laminated on the upper step side in the same manner, and the dividing position is set by the bolt nuts 27, 28. Link.

At this time, as shown in FIG. 7, between the horizontal beams 20c of the precast panel 20 which are vertically adjacent to each other, as shown in FIG.
The sealing material 32 is interposed. It should be noted that each sealing material 32 is provided with a hole for inserting the fixing anchor 22.

When the lamination and connection of the predetermined number of precast panels 20 is completed, the precast panels 20 are
A jerk 34 for support is installed between the pier and the pier 12.

In the case of the present embodiment, the installation position of the jack 34 is set to a dividing position in the circumferential direction of the precast panel 20, and the telescopic plunger of each jack 34 is brought into contact with the vertical beam 20b of the precast panel 20. Is installed in.

Further, a plurality of jacks 34 are provided at equal angular intervals along the circumferential direction in accordance with the size and height of the temporary cofferdam 18 to be constructed, and, if necessary, in a multistage shape in the vertical direction. Is installed in.

The precast panel 20 and the pier 12
As will be described later, the supporting member provided between the fixing member 22 and the supporting member is provided to ensure the stability of the laminated temporary cofferdams 18 when the prestressing force is applied to the fixing anchor 22. It is not limited to 34.

In this case, if the jack 34 is used, it is possible to easily cope with the variation in the distance between the precast panel 20 and the pier 12, and it is possible to easily install the supporting material.

When the support of the temporary cut-off work 18 from the inside by the jack 34 is completed, the uppermost precast panel 2
Attach a tension tool such as a hole-in jack to the fixing anchor 22 protruding upward from 0 to fix the fixing anchor 2
The fixing anchor 22 is fixed to the precast panel 20 by introducing a prestress to the precast panel 20.

When a prestressing force is applied to the fixing anchor 22, the transverse beams 20c of the precast panel 20 which are vertically laminated are in close contact with each other so as to sandwich the sealing material 32, and are laminated and connected to the footing 14. The temporary cut-off work 18 having a water blocking structure, which is integrated with the precast panel 20, is completed.

When the temporary deadline 18 is completed, the internal water is drained to create a dry working space around the pier 12, and the repair work such as the reinforcement of the pier 12 and the footing 14 is performed, and the repair work is completed. Then, water is introduced into the temporary deadline 18 and the work opposite to that at the time of assembling is performed, whereby the temporary deadline 18 is disassembled and removed.

According to the temporary cut-off method and the temporary cut-off structure constructed as described above, the precast panel 20, which is the main part of the temporary cut-off work 18, is manufactured in advance in a factory, and therefore a high quality product is obtained. At the same time, after transporting this to the site of repairing the underwater structure, the seal members 24, 26, 32 are interposed between the underwater structure (footing 14) and the dividing part and the joint in the vertical direction, and the pier 12 It can be constructed by surrounding the outer circumference of the anchor and introducing prestressing force to the anchoring anchor 22, and there is very little on-site work such as placing a sheet pile. Therefore, the temporary deadline 18 is easy. And it can be built quickly.

Further, the removal after the repair work can be easily performed, which is suitable for the rapid construction. Further, in the case of the present embodiment, the temporary cut-off work 18 is constructed on the upper surface side of the footing 14,
Unlike the conventional temporary cutout, which has a single structure unlike the double structure, the temporary cutoff 18 is smaller than the size of the footing 14 and does not occupy a large area, which does not hinder water traffic.

Further, since the temporary shut-off work 18 of the present invention does not require the filling of earth and sand, it does not pollute the water quality. Further, in the case of the present embodiment, when the precast panels 20 are connected in the circumferential direction, the connected precast panels 20 are connected.
Since the steel pipe accommodating recess 20f serving as a pin supporting portion that allows the horizontal movement of the temporary fastening member 18 is provided, it is possible to prevent bending stress from acting on the temporary fastening member 18 when an unbalanced load is applied to the temporary fastening member 18. it can.

In the above embodiment, the temporary cut-off work 18 having a circular cross section is illustrated, but the embodiment of the present invention is not limited to this shape. For example, a polygonal shape, an elliptical shape, or an oval shape can be used. Can also be applied.

The number of divisions of the precast panel 20 in the circumferential direction is not limited to four, and can be appropriately selected according to the size of the temporary cofferdam to be constructed.

[0046]

As described above in detail in the embodiments,
According to the temporary cutoff method and the temporary cutoff structure according to the present invention, the following operational effects are obtained. ． The precast panel can be manufactured in a factory, and therefore, a high quality one can be obtained, and the precast panel can be diverted, which is economically advantageous. ． The single structure and compact structure are suitable for rapid construction and do not require a large occupied area, so they are economical and do not hinder water transportation.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view of an assembled state of a temporary shutoff structure according to the present invention.

FIG. 2 is a top view of FIG.

3 is a perspective view of a precast panel used in the temporary shut-off structure shown in FIG. 1. FIG.

FIG. 4 is an enlarged view of part A in FIG.

5 is an enlarged view of part B in FIG.

FIG. 6 is an enlarged view showing another portion of section A of FIG.

FIG. 7 is an enlarged view of a C portion of FIG.

FIG. 8 is a sectional view of an essential part showing another example of the pin support part used in the temporary shut-off structure of the present invention.

FIG. 9 is a plan view and a cross-sectional explanatory view showing an example of a conventional double deadening method.

[Explanation of symbols]

10 bridges 12 piers 14 footing 18 Temporary deadline 20 precast panel 20a skin plate 20b vertical beam 20c horizontal beam 20d vertical rib 22 Fixing anchor 24 Seal material 26 Water sealing material 32 Seal material 34 Jack

Continuation of the front page (56) References JP-A-4-336123 (JP, A) Jitsuko 48-3442 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02D 19 / 04

Claims (4)

(57) [Claims] 1. A temporary cut-off method in which the outer periphery of an underwater structure such as a bridge foundation is bent by a temporary cut-off work, and the inside of the temporary cut-off work is drained to perform repairs such as repair and reinforcement of the underwater structure. In, the temporary cut-off work is divided along the vertical and circumferential directions of the underwater structure, comprises a plurality of precast panels that can be connected to each other, a plurality of one end is fixed to the foundation portion of the underwater structure. A fixing anchor is erected, and after transporting the precast panel to the site of renovation of the underwater structure, a dividing portion between the precast panels and a vertical joint portion, and a seal between the precast panel and the foundation portion, respectively. While interposing a material, the fixing anchor is inserted and laminated and connected on the base portion, and in this state, a prestressing force is introduced to the fixing anchor to A method of integrating the divided and stacked linked precast panels, the before introducing the prestressing force to the fixing anchor, during lamination linked the precast panel and said underwater structure, telescopic A plurality of supporting materials consisting of various jacks are installed along the circumferential direction of the temporary cut-off work, and a stopper provided on the lowermost precast panel
Between the precast panel and the foundation by
A temporary cut-off construction method characterized in that the position of the sealing material interposed therebetween is regulated . [2] Temporarily tightening the outer circumference of an underwater structure such as a bridge foundation
Encircle with the cut work, drain the inside of the temporary cut-off work, and
For temporary shut-off structures that perform repairs such as repairs and reinforcements for medium structures
In the above, the temporary cut-off work is performed in the vertical and circumferential directions of the underwater structure.
It is divided along and is erected on the foundation of the underwater structure.
Can be connected to each other while being inserted into the fixed anchor
A plurality of precast panels are provided, the precast panels being connected in the circumferential direction.
A skin plate defining an outer peripheral surface, a plurality of vertical beams vertically mounted on the skin plate, and fixedly provided on an inner surface of the precast panel in the vertical direction,
In the connected state, the cross beam is formed into an annular shape, and in the laminated connected state of the precast panel, there are divided parts and
And a sealing material that is interposed between the vertical joining portion and the precast panel that is arranged at the bottom,
There is an interposition between the precast panel and the foundation part.
A stopper to regulate the position of the sealing material
And a temporary deadline structure. 3. The precast panel on the vertical beam.
The precast panels that were joined when they were joined in the circumferential direction
Characterized by the provision of a pin support part that allows horizontal movement of the
The temporary deadline structure according to claim 2. 4. The vertical direction on the inner surface side of the skin plate
A plurality of vertical reinforcing ribs extending in the
The temporary deadline structure according to claim 2 or 3.